U.S. patent number 7,973,324 [Application Number 12/325,505] was granted by the patent office on 2011-07-05 for lamp type light emitting device for safety fuse.
Invention is credited to Wen-Ho Cheng, Wen-Tsung Cheng.
United States Patent |
7,973,324 |
Cheng , et al. |
July 5, 2011 |
Lamp type light emitting device for safety fuse
Abstract
A lamp type light emitting device for safety fuse, including a
substrate, an electrode layer, a chip set, a wire set, two leads
and an encapsulator. The electrode layer is arranged on the
substrate and includes a first T-shaped electrode, a second
T-shaped electrode, a first stripe electrode and a second stripe
electrode. The chip set includes a first resistor chip and a first
light emitting chip arranged on the first T-shaped electrode and a
second resistor chip and a second light emitting chip arranged on
the second T-shaped electrode. The wire set has fuse wires
electrically connected the first resistor chip, the first light
emitting chip, the first stripe electrode, the second resistor
chip, second light emitting chip, and the second stripe electrode.
The leads are electrically connected to the first and the second
T-shaped electrodes. The encapsulator encapsulates the electrode
layer, the chip set and the wire set.
Inventors: |
Cheng; Wen-Tsung (Taoyuan,
TW), Cheng; Wen-Ho (Taoyuan, TW) |
Family
ID: |
42221956 |
Appl.
No.: |
12/325,505 |
Filed: |
December 1, 2008 |
Prior Publication Data
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Document
Identifier |
Publication Date |
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US 20100133552 A1 |
Jun 3, 2010 |
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Current U.S.
Class: |
257/81; 315/51;
313/512; 315/46; 257/88; 257/99; 313/331; 313/498; 257/100 |
Current CPC
Class: |
H01L
25/167 (20130101); H01L 2224/48091 (20130101); H01L
2224/45144 (20130101); H01L 2224/48247 (20130101); H01L
2224/48091 (20130101); H01L 2924/00014 (20130101); H01L
2224/45144 (20130101); H01L 2924/00 (20130101) |
Current International
Class: |
H01L
33/00 (20100101) |
Field of
Search: |
;257/88,99,100,81
;313/512,331,498 ;315/46,51 |
References Cited
[Referenced By]
U.S. Patent Documents
Primary Examiner: Parker; Ken A
Assistant Examiner: Ho; Anthony
Attorney, Agent or Firm: Shih; Chun-Ming HDLS IPR
Services
Claims
What is claimed is:
1. A lamp type light emitting device for safety fuse, comprising: a
substrate having a top surface and a bottom surface; an electrode
layer arranged on the top surface of the substrate, the electrode
layer comprising a first T-shaped electrode, a second T-shaped
electrode, a first stripe electrode and a second stripe electrode;
a chip set comprising a first resistor chip and a first light
emitting chip arranged on the first T-shaped electrode and a second
resistor chip and a second light emitting chip arranged on the
second T-shaped electrode; a wire set having a plurality of fuse
wires respectively electrically connected the first resistor chip
to the first light emitting chip, the first light emitting chip to
the first stripe electrode, the second resistor chip to the second
light emitting chip, and the second light emitting chip to the
second stripe electrode; two leads arranged on two opposite sides
of the substrate and respectively electrically connected to the
first T-shaped electrode and the second T-shaped electrode; and an
encapsulator encapsulating the electrode layer, the chip set and
the wire set.
2. The device according to claim 1, wherein the substrate is made
of insulating material.
3. The device according to claim 1, wherein the electrode layer is
made from copper foil.
4. The device according to claim 1, wherein the first and second
resistor chips are current limiting resistors.
5. The device according to claim 1, wherein the fuse wires of the
wire set are gold wires.
6. The device according to claim 1, wherein the encapsulator is
made of transparent epoxy resin.
Description
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a light emitting device, in
particular to a lamp type light emitting device for safety
fuse.
2. Description of Related Art
Safety fuses in car or other vehicle are electrically connected to
control circuit of the car to prevent the control circuit from
damaging by suddenly reverse current generated when the car is
igniting or the switches thereof are turned on.
Conventional safety fuse includes a fuse wire electrically
connecting between two conductive stripes which are packaged
together in a shell. Once the fuse wire is burned out, it will not
be possible to observe by a user outside the shell. The user has to
plug and test all the safety fuses in a car one by one and
consequently it wastes a lot of time. In order to improve the
efficiency of the test, a low resistance light emitting diode is
added into the safety fuse and is electrically connected between
the two conductive stripes thereof. When the fuse wire is burned
out, electrical current will flows into the light emitting diode to
light it on. Therefore, after the safety fuse box is opened, the
lighted-on blown safety fuse can notice the user for
replacement.
But, since the low resistance light emitting diode is easy to burn
out under a great amount of instantaneous current, a high
resistance resistor is further electrically connected between the
light emitting diode and one of the conductive stripes to limit
maximum current flow to protect the light emitting diode. However,
the multiple connections of the components of the safety fuse
increase the difficulty of manufacturing.
SUMMARY OF THE INVENTION
The subject of present invention is to provide a lamp type light
emitting device used for safety fuse and having resistance
characteristic, which can be electrically connected between two
conductive stripes of a safety fuse, capable of being installed
between two conductive stripes of the safety fuse and bearing
greater current flow when the light emitting device is lighted
on.
In order to achieve aforementioned purpose, the present invention
provides a lamp type light emitting device for safety fuse,
including a substrate, an electrode layer, a chip set, a wire set,
two leads and an encapsulator. The substrate has a top surface and
a bottom surface. The electrode layer is arranged on the top
surface of the substrate, the electrode layer includes a first
T-shaped electrode, a second T-shaped electrode, a first stripe
electrode and a second stripe electrode. The chip set includes a
first resistor chip and a first light emitting chip arranged on the
first T-shaped electrode and a second resistor chip and a second
light emitting chip arranged on the second T-shaped electrode. The
wire set has a plurality of fuse wires respectively electrically
connected the first resistor chip to the first light emitting chip,
the first light emitting chip to the first stripe electrode, the
second resistor chip to the second light emitting chip, and the
second light emitting chip to the second stripe electrode. The two
leads are arranged on two opposite sides of the substrate and
respectively electrically connected to the first T-shaped electrode
and the second T-shaped electrode. The encapsulator encapsulates
the electrode layer, the chip set and the wire set.
BRIEF DESCRIPTION OF THE DRAWINGS
The features of the invention believed to be novel are set forth
with particularity in the appended claims. The invention itself
however may be best understood by reference to the following
detailed description of the invention, which describes certain
exemplary embodiments of the invention, taken in conjunction with
the accompanying drawings in which:
FIG. 1 is a perspective view of a lamp type light emitting device
of the present invention;
FIG. 2 is another perspective view of the lamp type light emitting
device of the present invention;
FIG. 3 is a top view of the lamp type light emitting device of the
present invention;
FIG. 4 is a side view of the lamp type light emitting device of the
present invention;
FIG. 5 is a equivalent circuit diagram of the lamp type light
emitting device of the present invention; and
FIG. 6 is a perspective view of car safety fuse with the lamp type
light emitting device of the present invention.
DETAILED DESCRIPTION OF THE INVENTION
A detailed description of the present invention will be made with
reference to the accompanying drawings.
FIG. 1 is a perspective view of the lamp type light emitting device
for safety fuse of the present invention. The lamp type light
emitting device 10 includes a substrate 1, an electrode layer 2, a
chip set 3, a wire set 4 and two leads 5.
The substrate 1 has a top surface 11 and a bottom surface 12. In
this embodiment, the substrate 1 is made of insulating
material.
The electrode layer 2 is arranged on the top surface 11 of the
substrate 1. The electrode layer 2 includes a first T-shaped
electrode 21a, a second T-shaped electrode 21b, a first stripe
electrode 22a and a second stripe electrode 22b. In this
embodiment, the electrode layer 2 is made from copper foil.
The chip set 3 includes a first resistor chip 31a and a first light
emitting chip 32a both arranged on the first T-shaped electrode
21a. Further, the chip set 3 also includes a second resistor chip
31b and a second light emitting chip 32b arranged on the second
T-shaped electrode 21b. In this embodiment, the first resistor chip
31a and second resistor chip 31b are current limiting resistors for
protecting the first light emitting chip 32a and the second light
emitting chip 32b.
The wire set 4 has a plurality of fuse wires respectively
electrically connecting the first resistor chip 31a to the first
light emitting chip 32a, the first light emitting chip 32a to the
first stripe electrode 22a, the second resistor chip 31b to the
second light emitting chip 32b, and the second light emitting chip
32b to the second stripe electrode 22b. Therefore, a light emitting
circuit with polarity-less operation is made of the aforementioned
first and second set of circuit. In this embodiment, the fuse wires
of the wire set 4 are gold wires.
The two leads 5 are arranged on two opposite sides of the substrate
1 and respectively electrically connected to the first T-shaped
electrode 21a and the second T-shaped electrode 21b. The leads 5
are used as an output terminal and an input terminal of the light
emitting circuit.
FIG. 2 is a perspective view of the lamp type light emitting device
for safety fuse of the present invention. The lamp type light
emitting device can also include an encapsulator 6 for
encapsulating the electrode layer 2, the chip set 3, and the wire
set 4 to protect those components from exterior damage. Besides, a
lens structure for modifying the light beam characteristic can be
further formed on the encapsulator 6.
FIG. 3 and FIG. 4 respectively show a top view and a side view of
the lamp type light emitting device for safety fuse of the present
invention. While a positive voltage is applied on the left side
lead 5 and a negative voltage is applied on the right side lead 5,
the electrical current flows through the first resistor 31a and the
first light emitting chip 32a. Therefore, the first light emitting
chip 32b will be lighted on.
Similarly, while a negative voltage is applied on the left side
lead 5 and a positive voltage is applied on the right side lead 5,
the electrical current flows through the second resistor 31b and
the second light emitting chip 32b. Therefore, the second light
emitting chip 32b will be lighted on.
FIG. 5 shows an equivalent circuit diagram of the lamp type light
emitting device of the present invention. The equivalent circuit
includes two independent sets of circuits. First set of circuit
includes the resistor chip 31a and the light emitting chip 32a
electrically connected in series. Second set of circuit includes
the resistor chip 31b and the light emitting chip 32b electrically
connected in series.
The input terminal of the first resistor chip 31a is electrically
connected to the output terminal of the second light emitting chip
32b. The input terminal of the second resistor chip 31b is
electrically connected to the output terminal of the first light
emitting chip 32a. Thus, a light emitting circuit with
polarity-less operation is formed.
While a positive voltage is applied on the input terminal A and a
negative voltage is applied on the input terminal B, the first
resistor chip 31a and the first light emitting chip 32a of the
first set of circuit are electrically charged, then the first light
emitting chip 32a will be lighted on. Similarly, while a negative
voltage is applied on the input terminal A and a positive voltage
is applied on the input terminal B, the second resistor chip 31b
and the second light emitting chip 32b of the second set of circuit
are electrically charged, then the second light emitting chip 32b
will be lighted on.
FIG. 6 shows a car safety fuse with the lamp type light emitting
device of the present invention. The lamp type light emitting
device is installed in a shell 20 of the car safety fuse. The two
leads 5 are electrical connected to two conductive stripes 201 and
202 in the shell 20 of the safety fuse. When the fuse wire 203
electrically connected between the conductive stripes 201 and 202
is blown by the instantaneous large current flowed from the
conductive stripe 201 or 202, at least one of the light emitting
chips 32a, 32b will light on to notice the user for
replacement.
Although the present invention has been described with reference to
the foregoing preferred embodiments, it will be understood that the
invention is not limited to the details thereof. Various equivalent
variations and modifications can still occur to those skilled in
this art in view of the teachings of the present invention. Thus,
all such variations and equivalent modifications are also embraced
within the scope of the invention as defined in the appended
claims.
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